Call block fails to carry scope when outer macro uses {% set %} or keyword argument

[albedoa]

This looks like it might be a remnant of #906, but maybe it's expected behavior. Please let me know if I am missing something. The only addition I've made to the example given in that issue is the keyword argument in the outside() signature:

{% macro inside() %}
  <div>inside: {{ caller() }}</div>
{% endmacro %}

{% macro outside(var = "baz") %}
  <div>outside: {{ var }}</div>

  {% call inside() %}
    {{ var }}
  {% endcall %}
{% endmacro %}

{{ outside("foobar") }}

The output is:

outside: foobar
inside:

I expect the output to be:

outside: foobar
inside: foobar

A demo can be seen here: http://jsfiddle.net/j8Lur5tx/

Edit: I seem to have been wrong about the cause of this behavior. It also happens to variables set in the outer macro block. The following produces the same effect:

{% macro inside() %}
  <div>inside: {{ caller() }}</div>
{% endmacro %}

{% macro outside() %}
  {% set var = "baz" %}

  {% call inside() %}
    {{ var }}
  {% endcall %}
{% endmacro %}

{{ outside() }}